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What is refractive Index? How its …

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What is refractive Index? How its calculate

Posted by Yash Vashisht 6 years ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years ago

A ray of light changes its direction when it enters from one medium to another medium. This happens because speed of light is different in different media. For example; the speed of light is 3 x 108 m/s (2.99x108 m/s) in vacuum and it is 2.98 x 108 m/s in air.

Refractive Index is the extent of change of direction of light in a given pair of media. The refractive index is a relative value of speed of light in the given pair of media. Thus, to calculate the refractive Index the speed of light in two media is taken.

Let the speed of light in medium 1 is v₁ and in medium 2 is v₂

Therefore; refractive index of medium 2 with respect to medium 1 (n₂₁)

n₂₁=Speed of light in medium 1/Speed of light in medium 2

Or, n₂₁=v₁/v₂

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